<!DOCTYPE HTML>
<html>
<body>
  <div style="position:absolute;">Hello</div>
  <div style="position:fixed;">Kitty</div>
  <script>
    document.body.offsetTop;
    document.documentElement.style.display = "table";
    document.body.offsetTop;
    document.documentElement.style.display = "";
    document.body.offsetTop;

    document.documentElement.style.position = "absolute";
    document.body.offsetTop;
    document.documentElement.style.display = "table";
    document.body.offsetTop;
    document.documentElement.style.display = "";
    document.body.offsetTop;

    document.documentElement.style.position = "fixed";
    document.body.offsetTop;
    document.documentElement.style.display = "table";
    document.body.offsetTop;
    document.documentElement.style.display = "";
    
    document.documentElement.style.position = "";
    document.body.offsetTop;
  </script>
</body>
</html>
